# Trailer GPS Tracking: How to Track Trailers With and Without a Truck Attached

A trailer spends most of its life unhitched, which is exactly when a truck-based tracker stops seeing it. Here's how trailer tracking works — Bluetooth tags through the nearest GO device, standalone battery or solar trackers, and reefer sensors — and which fits a given trailer pool.

Source: https://www.highpointgps.com/resources/trailer-gps-tracking-guide
By Stefano Mazzone, IT Technical Support Specialist — published 2026-09-18, updated 2026-09-18

## The Trailer Problem

A fleet knows where its tractors are because each one carries a powered telematics device. The trailer behind it is visible only while it is hitched: the moment it is dropped at a customer yard, a rail ramp or the back lot, it disappears from the map. Fleets with more trailers than tractors — most freight fleets run two or three to one — lose track of exactly the assets they have the most of. Trailers are found by phone calls, drivers are sent to the wrong yard, and a trailer that sits at a customer for a week costs a day of detention nobody billed.

## Three Ways to Track a Trailer

The lightest option is a Bluetooth asset tag. A small battery beacon on the trailer is heard by any GO device that comes within range, and that device relays the tag's identity and location into MyGeotab. It costs little and the battery lasts years, but it only reports when a tracked vehicle is nearby, which suits trailers that live in the fleet's own yards and are pulled by the fleet's own tractors.

A standalone trailer tracker has its own GPS and cellular modem, powered by a long-life battery or a solar panel, and reports on a schedule — every few hours parked, more often moving. It sees the trailer wherever it is, including a customer's yard three provinces away, and is the answer for drop-and-hook operations, pooled trailers and anything left unattended for long periods. Its cost is a device and a modest monthly plan per trailer.

For trailers with something worth monitoring on board, the tracker also carries sensors: reefer temperature and setpoint, door open and close, cargo presence. A refrigerated trailer's tracker doubles as the cold-chain record, and a door sensor plus a geofence turns a trailer opening outside a customer site into an alert.

## What Fleets Actually Do With It

Detention billing is the fastest payback: a timestamped arrival and departure at the customer's geofence is the evidence a detention invoice needs, and the invoice gets paid. Trailer pool sizing is the second — a utilization report shows which trailers moved this month and which did not, and a fleet usually finds it can run with fewer. Dispatch improves because the board shows which trailers are empty and where; theft recovery becomes routine because a trailer that leaves the yard at 2 a.m. raises an alert, not a police report a week later.

## Choosing for a Given Pool

Trailers that stay in the fleet's own network, pulled by the fleet's own tractors: Bluetooth tags are enough. Trailers dropped at customers, interchanged with partners or left at rail ramps: standalone trackers, with a reporting interval matched to how long a trailer normally sits. Reefers: a tracker with temperature sensing, whichever way it connects. Most fleets end up with a mix, and the platform shows all of them on the same map as the tractors.

## FAQ

### Can I track a trailer without a truck attached?

Yes, with a standalone trailer tracker that has its own GPS and cellular connection powered by a battery or solar panel. A Bluetooth tag only reports when a tracked vehicle is nearby.

### How long does a trailer tracker battery last?

Battery-powered trackers typically run for years on a parked reporting interval of a few hours; solar units recharge themselves. Bluetooth tags last several years.

### Can trailer tracking show temperature?

Yes. Trackers with a temperature sensor, or a reefer connection, report temperature alongside location and can alert on excursions.

### How does trailer tracking help with detention?

Geofenced arrival and departure times at the customer site are the timestamped evidence a detention invoice needs.

### Does a Bluetooth trailer tag need its own data plan?

No. It relays through a nearby GO device's connection, which is why it costs so little to run.

## Sources

- [Geotab: Asset Tracking](https://www.geotab.com/fleet-management-solutions/asset-tracking/)
- [Geotab Marketplace](https://marketplace.geotab.com/)